I-shape duct

ABSTRACT

A duct constructed within a building, consisting of an upper and a lower horizontal duct passing horizontally through the building at the upper and the lower part thereof and a vertical duct connecting the upper and the lower horizontal duct within the building having the whole shape of the letter I, and the ducts being structured such that the static pressure in the place where the upper horizontal duct intersects the vertical duct is less than that in the region where the lower horizontal duct does the vertical duct, and an ascending air current is thus generated in the vertical duct by means of the wind.

United States Patent 11 1 1111 3,800,685 Kitamura Apr.- 2, 1974 154]l-SHAPE DUCT 7 2,084,787 6/1937 Zoustinsky 98/20 [75] Inventor: RyuzoKitamura, Tokyo, Japan FOREIGN PATENTS OR APPLICATIONS '73 A ig Tokyo GCo. t Chu0 ku 725,730 2/]932 France 98/32 Tokyo, Japan PrimaryExaminer-W1ll1am J. Wye I l22l F'lcd: 29, 1972 Attorney, Agent, orFirmWcndcroth, Lind & Ponack [2]] Appl. No.: 284,751

[57] ABSTRACT 52 us. (:1 98/32, 417/151/98/20, A duct construct! F abuilding F F 98/33 upper and a lower horizontal duct passinghorizontally through the building at the upper and the lower part [51]Int. Cl F24f 13/00 thereof and a vertical duct connect) the u er and 58Field of Search 98/32, 33 R, 33 A, 20; g PP I 417/151 the lowerhorizontal duct within the building having the whole shape of the letterI, and the ducts being structuredsuch that the static pressure in theplace [56] References Cited where the upper horizontal duct intersectsthe vertical UNlTED STATES PATENTS duct is less than that in the regionwhere the lower l,39l,2l7 9/l92l Stewart 98/33 R horizontal duct doesthe vertical duct and an a cend- 802,87l 10/1905 Matton 98/32 m iCurrent i thus generated inihe vertical duct by 196092] 6H9) means ofthe wind. 1,056,989 3/l9l3 1,250,927 12/1917 Mead 98/20 5 Claims, 4Drawing Figures SUMMARY OF THE INVENTION This invention relates to anair supply and exhaust system constructed within a building andconsisting of an upper and a lower horizontal duct passing horizontallythrough the building at the upper and the lower part thereof and avertical duct connecting the upper andthe lower horizontal duct withinthe building and having the whole shape of the letter I.

In the l-shape system a fan may be considered often attached within thevertical duct or in the upper horizontal duct in order to increasescirculation and improve combustion current in the vertical duct.

It is the object of the present invention to generate an ascending aircurrent in a vertical duct by means of the wind.

BRIEF EXPLANATION OF THE DRAWINGS FIG. 1 shows an I-shape system whichmakes it possible to reduce the'resistance of airflowing in the lowerhorizontal duct less than that of air flowing in the upper horizontalduct. 7

FIG. 2 is a view of l-shape system provided a static chamber in thelower horizontal duct in the region intersecting the vertical duct.

' FIG. 3 shows an I-shape system including an accelerating chamber inthe upper horizontal duct in the region intersecting the vertical duct.I

FIG. 4 shows an I-shape duct provided an accelerating chamber in thepart where the upper horizontal dict intersects the vertical duct and'astatic chamber in the part where the lowerhorizontal duct intersects thevertical duct.

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a ductconstructed within a building, consisting of an upper and a lowerhorizontal duct passing horizontally through the building at the upperand the lower part thereof and a vertical duct connecting the upper andthe lower horizontal duct within the building, the system having theshape of the letter I and wherein an ascending air current is to begenerated in the' vertical duct at wind blowing.

As shown in the embodiment FIG. 1, this embodiment is constructed suchof that the cross-sectional area of the upper horizontal duct 1 islarger than that of the lower horizontal duct 2, so that the resistanceof air flowing in the upper horizontal duct 1 is to be less than that ofair flowing in the lower horizontal duct 2.

is provided in the region where the lower horizontal duct 2 intersectsthe vertical duct 3.

In this manner an ascending air current is created in the vertical duct,when wind pressure influences the ducts from the direction of the arrowand the air in the vertical moves to the upper horizontal duct 1 becausethe static pressure in the region where the upper horizontal duct 1intersects the vertical duct 3 is less than that in the static chmaber4.

FIG. 3 shows a third embodiment, where the resistance of air flowingthrough the upper horizontal duct 1 and the lower horizontal duct 2 isgenerally the same and an accelerating chamber 5 is constructed in theregion where the upper horizontal duct 1 intersects the vertical duct 3.

In this embodiment, when the ducts are influenced by wind currents fromthe direction of the arrow, the air in the vertical duct 3 is turnedinto'ascending air currents as shown by the arrow through moving to theupper horizontal duct 1, as the static pressure in the acceleratingchamber 5 is less than that in the part where the lower horizontal duct2 intersects the vertical duct 3.

FIG. 4 shows a fourth embodiment, where the upper and the lowerhorizontal duct are so constituted as generally have the same resistanceto flowing air, and in the narrow region where the upper horizontal duct1 intersects the vertical duct 3 an accelerating chamber 5 is provided.Static chamber 4 is constructed in the enlarged part where the lowerhorizontal duct 2 intersects the vertical duct 3.

In this manner, when the ducts are influenced by wind currents from thedirection of the arrow, the static pressure in the accelerating chamber5 is less than that in the static chamber 4, and the air in the verticalduct 3 moves to the upper horizontal duct 1 as shown by the arrow.

The present invention constructed as described above is able to generatean ascending air current in the vertical duct 3 by means of theprevailing winds. And the ascending air current in the vertical duct 3may effectively increase suction of air and exhaust of exhaust gas, whenair for combustion is sucked into the vertical duct 3 and exhaust gas ofcombustion of exhausted into wardly into the upper horizontal duct 1,and an ascending air current is thus generated in the vertical duct 3 asshown by the arrow.

In the embodiment of FIG. 2, the resistance of air flowing in the upperhorizontal duct 1 and the lower horizontal duct 2 is the same, and astatic chamber 4 the same vertical duct and then into the upperhorizontal pipe. I

What is claimed isi 1. An air supply and exhaust duct system for abuilding comprising:

a first pipe member horizontally extending through said building; asecond pipe member horizontally extending through said building belowsaid first pipe; and a vertical pipe member connecting said first andsecond horizontal pipe members within said building one of saidhorizontal pipes being structured such that static pressure in theregion where said upper horizontal 'pipe member intersects said verticalpipe member is less than the static pressure in' the region where saidlower horizontal pipe member intersects said vertical pipe member.

2. The device of claim 1 wherein the cross-sectional I area of saidupper horizontal pipe member ,is greater than the cross-sectional areaof said lower horizontal pipe member.

3. The device of claim 1 wherein a static chamber is provided in theregion where said vertical pipe mem- 3 4 I ber intersects said lowerhorizontal pipe member and members having substantially equalcross-sectional arsaid upper and lower horizontal pipe members havingsubstantially equal cross-sectional areas.

4. The device of claim 1 wherein an accelerating chamber is provided inthe region where said upper 5 chamber in the region wherein saidvertical pipe memhorizontal pipe member intersects said vertical pipebet intersects said lower horizontal P p membermember and said upper andlower horizontal pipe 5. The device of claim 4 further comprising astatic

1. An air supply and exhaust duct system for a building comprising: afirst pipe member horizontally extending through said building; a secondpipe member horizontally extending through said building below saidfirst pipe; and a vertical pipe member connecting said first and secondhorizontal pipe members within said building one of said horizontalpipes being structured such that static pressure in the region wheresaid upper horizontal pipe member intersects said vertical pipe memberis less than the static pressure in the region where said lowerhorizontal pipe member intersects said vertical pipe member.
 2. Thedevice of claim 1 wherein the cross-sectional area of said upperhorizontal pipe member is greater than the cross-sectional area of saidlower horizontal pipe member.
 3. The device of claim 1 wherein a staticchamber is provided in the region where said vertical pipe memberintersects said lower horizontal pipe member and said upper and lowerhorizontal pipe members having substantially equal cross-sectionalareas.
 4. The device of claim 1 wherein an accelerating chamber isprovided in the region where said upper horizontal pipe memberintersects said vertical pipe member and said upper and lower horizontalpipe members having substantially equal cross-sectional areas.
 5. Thedevice of claim 4 further comprising a static chamber in the regionwherein said vertical pipe member intersects said lower horizontal pipemember.